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Journal articles on the topic 'Ketones Pyrazoles'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Lellek, Vit, Cheng-yi Chen, Wanggui Yang, Jie Liu, Xuebao Ji, and Roger Faessler. "An Efficient Synthesis of Substituted Pyrazoles from One-Pot Reaction of Ketones, Aldehydes, and Hydrazine Monohydrochloride." Synlett 29, no. 08 (2018): 1071–75. http://dx.doi.org/10.1055/s-0036-1591941.

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An efficient, one-pot and metal-free process for the preparation of 3,5-disubstituted and 3,4,5-trisubstituted pyrazoles on multi-gram scale was developed. One-pot condensation of ketones, aldehydes and hydrazine monohydrochloride readily formed pyrazoline intermediates under mild conditions. Oxidation of pyrazolines, in situ, employing bromine afforded a wide variety of pyrazoles. The methodology offers a fast, and often chromatography-free protocol for the synthesis of 3,4,5-substituted pyrazoles in good to excellent yields. Alternatively, a more benign oxidation protocol affords 3,5-disubst

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2

El-Alali, Abdullah, and Ahmed S. Al-Kamali. "Reactions of 1,3-dipolar aldazines and ketazines with the dipolarophile dimethyl acetylenedicarboxylate." Canadian Journal of Chemistry 80, no. 10 (2002): 1293–301. http://dx.doi.org/10.1139/v02-169.

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The prepared aldazines (aldehyde azines) and ketazines (ketone azines) were allowed to react with 2 mol of the acetylene derivative. The first products formed were pentalene azine derivatives, which in some cases underwent skeletal rearrangment into acyclic tetraene azines. The latter underwent, in the case of some aldazine products, further skeletal rearrangment into N-allyl pyrazoles. The occurence of these rearrangments is dependant on the nature of the aldehydes or ketones used.Key words: dimethyl acetylenedicarboxylate (DMAD), aldazines, ketazines, N-allyl pyrazoles.

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3

Hahn, Marianne, Gottfried Heinisch, Wolfgang Holzer, and Helga Schwarz. "Pyrazoles. 6. Synthesis of novel heteroaryl 4-pyrazolyl ketones." Journal of Heterocyclic Chemistry 28, no. 5 (1991): 1189–92. http://dx.doi.org/10.1002/jhet.5570280505.

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4

Albar, Hassan A. "1,3-Dipolar Cycloaddition of Four Hydrazonoyl Chlorides to β-Diketones and α,β-Unsaturated Ketones". Journal of Chemical Research 23, № 3 (1999): 182–83. http://dx.doi.org/10.1177/174751989902300306.

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The 1,3-dipolar cycloaddition of four hydrazonoyl chloride derivatives with the sodium salt of unsymmetrical β-diketones (benzoylacetone) offers a versatile method for the regioselective synthesis of 2 H-pyrazoles in a similar fashion to the cycloaddition of the nitrilimides with α,β-unsaturated ketones and esters; the structures of the prepared isomeric pyrazole and pyrazoline derivatives are established by spectroscopic and chemical methods.

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5

Thirunarayanan, Ganesamoorthy, and K. Ravi. "Synthesis and Spectral Correlation Study of some 3-(3,4-dichlorophenyl)-5-(Substituted Phenyl)-4,5-dihydro-¹H-Pyrazole-1-yl-Ethanones." International Letters of Chemistry, Physics and Astronomy 19 (October 2013): 44–57. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.19.44.

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Some N-acetyl pyrazoles including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones including substituted styryl 3,4-dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash: H2SO4 catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75%. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data. The infrared spectral νC=N and C=O (cm-1) frequencies, NMR

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6

Chovatia, P. T., J. D. Akabari, P. K. Kachhadia, P. D. Zalavadia, and H. S. Joshi. "Synthesis and selective antitubercular and antimicrobial inhibitory activity of 1-acetyl-3,5-diphenyl-4,5-dihydro-(1h)-pyrazole derivatives." Journal of the Serbian Chemical Society 71, no. 7 (2006): 713–20. http://dx.doi.org/10.2298/jsc0607713c.

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The new compounds 1-aryl-3-{1-phenyl-3-[p (methylthio)phenyl]pyrazol-4-yl}-2-propen-1-ones 2a?l were prepared by the condensation of 1-phenyl-3-[p (methylthio)phenyl]-4-formylpyrazole 1 with different aryl ketones. Compounds 2a?l in reaction with hydrazine hydrate yielded 3-aryl-5-{1-phenyl-3-[p-(methylthio)phenyl]pyrazol-4 yl}-4,5-dihydro-(1H)-pyrazoles 3a?l and in the presence of hydrazine hydrate in glacial acetic acid gave 1-acetyl-3-aryl 5-{1-phenyl-3-[p-(methylthio)phenyl]pyrazol-4-yl}-4,5 dihydro-(1H)-pyrazoles 4a?l. These compounds were tested in vitro for their antitubercular and anti

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7

Verlee, Arno, Thomas Heugebaert, Tom van der Meer, Pavel Kerchev, Frank Van Breusegem, and Christian V. Stevens. "Domino reaction of a gold catalyzed 5-endo-dig cyclization and a [3,3]-sigmatropic rearrangement towards polysubstituted pyrazoles." Organic & Biomolecular Chemistry 16, no. 48 (2018): 9359–63. http://dx.doi.org/10.1039/c8ob02807a.

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8

HAHN, M., G. HEINISCH, W. HOLZER, and H. SCHWARZ. "ChemInform Abstract: Pyrazoles. Part 6. Synthesis of Novel Heteroaryl 4-Pyrazolyl Ketones." ChemInform 23, no. 4 (2010): no. http://dx.doi.org/10.1002/chin.199204159.

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9

Kim, Jung Keun, Ming Gong, Elvira A. Shokova, et al. "Pyrazoles: ‘one-pot’ synthesis from arenes and carboxylic acids." Organic & Biomolecular Chemistry 18, no. 29 (2020): 5625–38. http://dx.doi.org/10.1039/d0ob01228a.

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A rapid and efficient method for ‘one-pot’ synthesis of pyrazoles from (hetero)arenes and carboxylic acids via successive formation of ketones and β-diketones followed by heterocyclization with hydrazine has been developed.

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10

Maity, Rajendra, and Subhas Chandra Pan. "Enantioselective aminocatalytic synthesis of tetrahydropyrano[2,3-c]pyrazoles via a domino Michael-hemiacetalization reaction with alkylidene pyrazolones." Organic & Biomolecular Chemistry 15, no. 38 (2017): 8032–36. http://dx.doi.org/10.1039/c7ob02170d.

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An enantioselective organocatalytic synthesis of fused tetrahydropyranopyrazole products has been achieved via a domino Michael-hemiacetalization reaction between alkylidene pyrazolones and cyclic ketones/pentanal.

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11

Fahim, Asmaa Mahmoud, Ahmad Mahmoud Farag, Mohamed Rabie Shaaban, and Eman Ali Ragab. "Synthesis and DFT study of novel pyrazole, thiophene, 1,3-thiazole and 1,3,4-thiadiazole derivatives." European Journal of Chemistry 9, no. 1 (2018): 30–38. http://dx.doi.org/10.5155/eurjchem.9.1.30-38.1675.

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Regioselective facile synthesis of innovative heterocycles from the reaction of 2-cyano-N-cyclohexylacetamide (3) with hydrazonoyl chloride (4) in basic condition afforded amino pyrazole derivative 6. The behavior of acetamide 3 with phenylisothiocyanate in DMF/KOH surveyed by addition of the α-halo ketones to yeild the corresponding thiophene derivative 13a, 13b, 16, 18 and 1,3-thiazoles 21. Reaction of intermediate potassium salt 9 with hydrazonoyl chloride 22a-e furnished the corresponding 1,2,4-thiadiazoles 24a-e. Density functional theory (DFT) calculations at the B3LYP and HF techniques

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12

Kim, JungKeun, Elvira Shokova, Victor Tafeenko, and Vladimir Kovalev. "(CF3CO)2O/CF3SO3H-mediated synthesis of 1,3-diketones from carboxylic acids and aromatic ketones." Beilstein Journal of Organic Chemistry 10 (September 26, 2014): 2270–78. http://dx.doi.org/10.3762/bjoc.10.236.

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A very simple and convenient reaction for 1,3-diketone preparation from carboxylic acids and aromatic ketones in TFAA/TfOH system is described. When the β-phenylpropionic acids were used as starting materials, they initially gave 1-indanones and then underwent further acylation with the formation of 2-(β-phenylpropionyl)-1-indanones as the main reaction products. In addition, the application of the proposed protocol allowed for the synthesis of selected polysubstituted pyrazoles in a one-pot procedure directly from acids and ketones.

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13

Krasavin, Mikhail, Sergey Chuprun, Dmitry Dar’in, Grigory Kantin та Petr Zhmurov. "α-Diazoacetamides in Sc(OTf)3-Catalyzed Tiffeneau–Demjanov Ring Expansion: Application towards the Synthesis of Rare Bicyclic Pyrazoles". Synlett 31, № 04 (2020): 373–77. http://dx.doi.org/10.1055/s-0039-1690047.

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A novel Sc(OTf)3-catalyzed Tiffeneau–Demjanov ring expansion of six-membered cyclic ketones has been developed. The resulting seven-membered cyclic β-keto carboxamides were found to be versatile precursors to rare bicyclic pyrazoles obtained in modest to good yields via condensation with aryl hydrazines in the presence of Lawesson’s reagent.

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14

Sevenard, Dmitri V., Oleg G. Khomutov, Nadezhda S. Boltachova, et al. "Metal and Boron Derivatives of Fluorinated Cyclic 1,3-Dicarbonyl Compounds." Zeitschrift für Naturforschung B 64, no. 5 (2009): 541–50. http://dx.doi.org/10.1515/znb-2009-0510.

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Starting from the corresponding cyclic 1,3-diketones or other precursors (cyclic ketones as well as lactones), several new salts and chelate complexes of fluorinated 1,3-dicarbonyls were obtained. Their preparative significance was demonstrated by straightforward syntheses of fluorinated pyrazoles, benzimidazoles and 1,7-ketoesters. The structure of a boron chelate of 2-(trifluoroacetyl)- cyclohexanone was investigated by X-ray diffraction.

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15

Andicsová, Anita, Angelika Lásiková, Marek Fronc, Jozef Kožíšek, and Daniel Végh. "3-(2-Heteroaryl)-pyrazolotetrazoles – a subunits for losartan-like structures." Acta Chimica Slovaca 5, no. 2 (2012): 220–24. http://dx.doi.org/10.2478/v10188-012-0033-z.

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Abstract A modification of biphenylyltetrazole moiety of Losartan (A) by 3-(2-heteroaryl)-pyrazolotetrazole (B) is described. Ketone semicarbazones react with two moles of phosphorus oxychloride-dimethylformamide with the formation of 3-substituted pyrazol-4-carbaldehydes. The transformations of 3-substituted pyrazole-4- carboxaldehydes to 3-substituted pyrazole-4-nitriles were carried out by reaction of hydroxylamine in DMFA. The prepared cyano pyrazoles were converted to tetrazoles by heating with trimethylsilylazide and dibuthyltinoxide in toluene.

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16

Bagley, Mark, M. Lubinu, and Christopher Mason. "Regioselective Microwave-Assisted Synthesis of Substituted Pyrazoles from Ethynyl Ketones." Synlett 2007, no. 5 (2007): 0704–8. http://dx.doi.org/10.1055/s-2007-970783.

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17

Da Silva, Caroline C., Rosiane M. Martins, Rafael G. Lund, Lucas Pizzuti, and Claudio M. P. de Pereira. "Recent Highlights on the Synthesis of Pyrazoles with Antimicrobial Activity." Current Bioactive Compounds 15, no. 5 (2019): 475–506. http://dx.doi.org/10.2174/1573407214666180730104941.

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Background: Heterocyclic compounds containing nitrogen atoms such as pyrazoles have a long history and applicability in the field of medicinal chemistry. Many compounds containing pyrazole moiety have been reported in the available literature for their prominent biological activities, including antimicrobial activity against different microorganisms. Over the years, there has been a concern with the many health problems associated with the dramatic increase of microbial infections and resistance to standard drugs, so there is a need for the development of more effective antimicrobial agents. P

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18

Bishop, Brian, Karel Brands, Andrew Gibb, and Derek Kennedy. "Regioselective Synthesis of 1,3,5-Substituted Pyrazoles from Acetylenic Ketones and Hydrazines." Synthesis 2004, no. 01 (2003): 43–52. http://dx.doi.org/10.1055/s-2003-44376.

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19

Missio, Lauri J., Hugo S. Braibante та Mara E. F. Braibante. "Reactivity of α-acylated β-enamino ketones and esters: Synthesis of pyrazoles". Journal of Heterocyclic Chemistry 33, № 4 (1996): 1243–45. http://dx.doi.org/10.1002/jhet.5570330441.

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20

Xiang, Jian-Nan, Jin-Heng Li, Ri-Yuan Tang, Xiao-Kang Guo, Ming Hu та Zhi-Qiang Wang. "Nickel-Catalyzed Oxidative Cyclotrimerization of α-Amino Ketones: Selective Synthesis of Pyrazoles". Synlett 25, № 01 (2013): 64–68. http://dx.doi.org/10.1055/s-0033-1340014.

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21

Zhang, Fa-Guang, Yi Wei, Yu-Ping Yi, Jing Nie, and Jun-An Ma. "Regioselective Cycloaddition of Trifluorodiazoethane with Electron-Deficient Allenic Esters and Ketones: Access to CF3-Substituted Pyrazolines and Pyrazoles." Organic Letters 16, no. 11 (2014): 3122–25. http://dx.doi.org/10.1021/ol501249h.

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22

Popov, A. V., E. V. Rudyakova, L. I. Larina, V. A. Kobelevskaya, and G. G. Levkovskaya. "Ratio of 1,3- and 1,5-dialkyl-substituted pyrazoles obtained from chlorovinyl alkyl ketones and alkylhydrazines, 3(5)-pyrazoles and alkyl bromides." Russian Journal of Organic Chemistry 50, no. 11 (2014): 1650–62. http://dx.doi.org/10.1134/s1070428014110190.

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23

Zhang, Jianlin, Yulong Zhang, Xiaohua Liu та ін. "Enantioselective Protonation by Aza-Michael Reaction between Pyrazoles and α-Substituted Vinyl Ketones". Advanced Synthesis & Catalysis 356, № 17 (2014): 3545–50. http://dx.doi.org/10.1002/adsc.201400616.

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24

Schmidt, Elena Yu, Elena V. Ivanova, Nadezhda V. Semenova, Inna V. Tatarinova, Igor A. Ushakov та Boris A. Trofimov. "Base-catalyzed α-vinylation of ketones with acetylenes as a key step in one-pot synthesis of pyrazolines and pyrazoles". Mendeleev Communications 25, № 2 (2015): 131–32. http://dx.doi.org/10.1016/j.mencom.2015.03.018.

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25

Zhang, Fa-Guang, Yi Wei, Yu-Ping Yi, Jing Nie, and Jun-An Ma. "ChemInform Abstract: Regioselective Cycloaddition of Trifluorodiazoethane with Electron-Deficient Allenic Esters and Ketones: Access to CF3-Substituted Pyrazolines and Pyrazoles." ChemInform 45, no. 48 (2014): no. http://dx.doi.org/10.1002/chin.201448132.

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26

Ivonin, Sergey P., Bohdan B. Kurpil’, Eduard B. Rusanov, Oleksandr O. Grygorenko, and Dmitry M. Volochnyuk. "N-Alkylhydrazones of aliphatic ketones in the synthesis of 1,3,4-trisubstituted non-symmetric pyrazoles." Tetrahedron Letters 55, no. 14 (2014): 2187–89. http://dx.doi.org/10.1016/j.tetlet.2014.02.058.

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27

ICHIKAWA, J., M. KOBAYASHI, Y. NODA, N. YOKOTA, K. AMANO, and T. MINAMI. "ChemInform Abstract: Regiocontrolled Syntheses of 3- or 5-Fluorinated Pyrazoles from 2,2- Difluorovinyl Ketones." ChemInform 27, no. 34 (2010): no. http://dx.doi.org/10.1002/chin.199634125.

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28

MISSIO, L. J., H. S. BRAIBANTE та M. E. F. BRAIBANTE. "ChemInform Abstract: Reactivity of α-Acylated β-Enamino Ketones and Esters: Synthesis of Pyrazoles." ChemInform 28, № 1 (2010): no. http://dx.doi.org/10.1002/chin.199701146.

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29

Tang, Ri-Yuan, Xiao-Kang Guo, Ming Hu, Zhi-Qiang Wang, Jian-Nan Xiang та Jin-Heng Li. "ChemInform Abstract: Nickel-Catalyzed Oxidative Cyclotrimerization of α-Amino Ketones: Selective Synthesis of Pyrazoles." ChemInform 45, № 23 (2014): no. http://dx.doi.org/10.1002/chin.201423147.

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30

Li, Shan, Zhengke Li, Dongjie Peng, et al. "Au(I)-Catalyzted Synthesis of 5-Bromodifluoromethyl Pyrazoles from Fluorinated Alkynyl Ketones and Hydrazine." Chinese Journal of Chemistry 29, no. 12 (2011): 2695–701. http://dx.doi.org/10.1002/cjoc.201180442.

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31

Sawengngen, Nattawut, Petrakis N. Chalikidi, Sara Araby, Frank Hampel, Peter Gmeiner, and Olga V. Serdyuk. "Synthesis of pyrazolylvinyl ketones from furan derivatives." Organic & Biomolecular Chemistry 17, no. 19 (2019): 4850–55. http://dx.doi.org/10.1039/c9ob00701f.

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32

Dhingra, Ashwani Kumar, Bhawna Chopra, Rameshwar Dass, and Sanjeev K. Mittal. "Synthesis and Anti-Inflammatory Activity of Some O-Propargylated-N-acetylpyrazole Derived from 1,3-Diarylpropenones." International Journal of Medicinal Chemistry 2016 (January 11, 2016): 1–6. http://dx.doi.org/10.1155/2016/3156593.

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In search of novel effective potent therapeutic agents delivered by oral route for inflammation treatment, some novel O-propargylated-N-acetylpyrazole analogs (5a–j) were prepared by treating N-acetylpyrazole (4a–j) derived from 1,3-diarylpropenones (3a–j) with propargyl bromide. Claisen-Schmidt condensation of a series of substituted aryl ketones 1 and benzaldehydes 2 in glacial acetic acid afforded 1,3-diarylpropenones which on further treatment with hydrazine hydrate in acetic acid under reflux conditions afforded 1-acetyl-3,5-diaryl-4,5-dihydro(1H)pyrazoles (4a–j). The products were charac

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33

Zhang, Jianlin, Yulong Zhang, Xiaohua Liu та ін. "ChemInform Abstract: Enantioselective Protonation by Aza-Michael Reaction Between Pyrazoles and α-Substituted Vinyl Ketones." ChemInform 46, № 17 (2015): no. http://dx.doi.org/10.1002/chin.201517171.

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34

Nargund, L. V. G., V. Hariprasad, and G. R. N. Reddy. "Synthesis and Anti-inflammatory Activity of Fluorinated Phenyl Styryl Ketones and N-Phenyl-5-Substituted Aryl-3-p-(fluorophenyl) Pyrazolins and Pyrazoles." Journal of Pharmaceutical Sciences 81, no. 9 (1992): 892–94. http://dx.doi.org/10.1002/jps.2600810910.

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35

Jin, Weiwei, Haifeng Yu та Zhengkun Yu. "Regioselective synthesis of multisubstituted pyrazoles via cyclocondensation of β-thioalkyl-α,β-unsaturated ketones with hydrazines". Tetrahedron Letters 52, № 44 (2011): 5884–87. http://dx.doi.org/10.1016/j.tetlet.2011.08.168.

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36

Heller, Stephen T., and Swaminathan R. Natarajan. "1,3-Diketones from Acid Chlorides and Ketones: A Rapid and General One-Pot Synthesis of Pyrazoles." Organic Letters 8, no. 13 (2006): 2675–78. http://dx.doi.org/10.1021/ol060570p.

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37

Světlík, Jan, та Ladislav Šallai. "Unexpected ring closure reaction of α,β-unsaturated ketones with aminoguanidine. entry into 1,3,5-trisubstituted pyrazoles". Journal of Heterocyclic Chemistry 39, № 2 (2002): 363–66. http://dx.doi.org/10.1002/jhet.5570390220.

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38

Li, Shan, Zhengke Li, Dongjie Peng, et al. "ChemInform Abstract: Au(I)-Catalyzed Synthesis of 5-Bromodifluoromethyl Pyrazoles from Fluorinated Alkynyl Ketones and Hydrazine." ChemInform 43, no. 16 (2012): no. http://dx.doi.org/10.1002/chin.201216117.

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39

Ivonin, Sergey P., Bohdan B. Kurpil', Eduard B. Rusanov, Oleksandr O. Grygorenko, and Dmitry M. Volochnyuk. "ChemInform Abstract: N-Alkylhydrazones of Aliphatic Ketones in the Synthesis of 1,3,4-Trisubstituted Non-Symmetric Pyrazoles." ChemInform 45, no. 37 (2014): no. http://dx.doi.org/10.1002/chin.201437141.

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40

Baldwin, Jack E., Gareth J. Pritchard, and Richard E. Rathmell. "The reactions of diacetylenic ketones with nitrogen nucleophiles; facile preparation of alkynyl substituted pyrimidines and pyrazoles." Journal of the Chemical Society, Perkin Transactions 1, no. 22 (October 26, 2001): 2906–8. http://dx.doi.org/10.1039/b108645f.

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41

Fan, Xiu-Wei, Tao Lei, Chao Zhou та ін. "Radical Addition of Hydrazones by α-Bromo Ketones To Prepare 1,3,5-Trisubstituted Pyrazoles via Visible Light Catalysis". Journal of Organic Chemistry 81, № 16 (2016): 7127–33. http://dx.doi.org/10.1021/acs.joc.6b00992.

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42

Sauers, Ronald R., та Susan D. Van Arnum. "γ-Hydroxyalkynyl Ketones as Useful Scaffolds for the Preparation of Combinatorial Libraries of Furans, Isoxazoles and Pyrazoles". Journal of Combinatorial Chemistry 6, № 3 (2004): 350–55. http://dx.doi.org/10.1021/cc030029+.

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43

Liu, Qun, Shugang Wang, Yongguang Li та Xihe Bi. "Synthesis of 1,3,4-Trisubstituted Pyrazoles from α-(1,3-Dithian-2-yl) Enamine Ketones via [4+1] Cyclization". Synlett 26, № 13 (2015): 1895–99. http://dx.doi.org/10.1055/s-0034-1378858.

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44

Bozhenkov, G. V., G. G. Levkovskaya, A. N. Mirskova та L. I. Larina. "5(4)-Chloro-1-(2,4-dinitrophenyl)pyrazoles from 2,4-Dinitrophenylhydrazones of Chlorovinyl Ketones and β,β-Dichloroacrolein". Chemistry of Heterocyclic Compounds 41, № 7 (2005): 854–60. http://dx.doi.org/10.1007/s10593-005-0238-9.

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45

Adamo, Mauro F. A., Robert M. Adlington, Jack E. Baldwin, Gareth J. Pritchard, and Richard E. Rathmell. "Practical routes to diacetylenic ketones and their application for the preparation of alkynyl substituted pyridines, pyrimidines and pyrazoles." Tetrahedron 59, no. 13 (2003): 2197–205. http://dx.doi.org/10.1016/s0040-4020(03)00244-8.

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46

Svetlik, Jan, та Ladislav Sallai. "ChemInform Abstract: Unexpected Ring Closure Reaction of α,β-Unsaturated Ketones with Aminoguanidine. Entry into 1,3,5-Trisubstituted Pyrazoles." ChemInform 33, № 38 (2010): no. http://dx.doi.org/10.1002/chin.200238106.

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47

Jin, Weiwei, Haifeng Yu та Zhengkun Yu. "ChemInform Abstract: Regioselective Synthesis of Multisubstituted Pyrazoles via Cyclocondensation of β-Thioalkyl-α,β-unsaturated Ketones with Hydrazines." ChemInform 43, № 9 (2012): no. http://dx.doi.org/10.1002/chin.201209119.

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48

Baldwin, Jack E., Gareth J. Pritchard, and Richard E. Rathmell. "ChemInform Abstract: The Reactions of Diacetylenic Ketones with Nitrogen Nucleophiles; Facile Preparation of Alkynyl Substituted Pyrimidines and Pyrazoles." ChemInform 33, no. 12 (2010): no. http://dx.doi.org/10.1002/chin.200212064.

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49

Sarkar, Debayan, and Sushree Ranjan Sahoo. "Monohydrochloride Assisted Synthesis of Functionalized Isoxazoles and Pyrazoles from Allenic Ketones: First Synthesis of (Z )-2-Methyl-7H-benzo[b]pyrazolo[5,1-d][1,5]oxazocines." European Journal of Organic Chemistry 2019, no. 10 (2019): 2035–49. http://dx.doi.org/10.1002/ejoc.201900008.

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Liu, Man, Chen-Fei Liu, Jing Zhang, Yan-Jun Xu, and Lin Dong. "Metal-free tandem reaction synthesis of spiro-cyclopropyl fused pyrazolin-5-one derivatives." Organic Chemistry Frontiers 6, no. 5 (2019): 664–68. http://dx.doi.org/10.1039/c8qo01378k.

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Abstract:

A highly efficient cascade annulation approach was developed for the synthesis of novel spiro-cyclopropyl fused pyrazolin-5-ones from pyrazole-3-ketone substrates and two-component sulfur ylides in an acidic environment.

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